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Andrew, You can not add a rail easily without some gunsmithing and tool room work.

Andrew, I would ask Rossi Customer Service at 229 515 8707 --- Monday - Friday 8:00AM to 8:00PM (EST) since several models came with a top Rail - https://www.budsgunshop.com/product_info.php/products_id/74803/rossi+usa+cir+judge+45%2f410+lvr ------------- https://www.budsgunshop.com/search.php?q=Rossi+Circuit+Judge&type=&search_in=description

I would talk to a gunsmith.